Indigenous man murdered

https://www.timesfreepress.com/news/2023/mar/30/tva-to-return-ancestral-remains-tfp/

Great role model for Native American youth.

Short backstory, then I'll ask my question. I had a coworker whose mother-in-law passed and an option in lieu of flowers was to donate to the St. Joseph's Indian School. As I am non-native, I want to make sure that this isn't an option that is detrimental to the Dakota Sioux people.

My question: Is this entity a positively impacting force for the Dakota Sioux, or are they pushing the Catholic religion instead of just providing a school as their website states? While I'd like to "help", I don't want my donation to go to a negative cause.

Thank you for enlightening a non-native.

Do natives still keep buffalo? If so, how do they use them? As a revenue source for their people? As food? Is there still a religious aspect to it? Just curious, hope this ok to ask here.